Oxime Ligation via in situ Oxidation of <i>N</i>-Phenylglycinyl Peptides
作者:Quibria A. E. Guthrie、Caroline Proulx
DOI:10.1021/acs.orglett.8b00713
日期:2018.5.4
Mild conditions for oxime ligationsvia in situ generation of α-imino amide intermediates are reported. The evaluation of a variety of N-terminal N-phenylglycine residues revealed that a metal-free, chemoselective oxidation was possible using oxygen as the only oxidant in buffer at pH 7.0. Moreover, selective unmasking of an inert residue by addition of potassium ferricyanide is demonstrated. These
Nucleophilic Catalysis of Hydrazone Formation and Transimination: Implications for Dynamic Covalent Chemistry
作者:Anouk Dirksen、Sjoerd Dirksen、Tilman M. Hackeng、Philip E. Dawson
DOI:10.1021/ja067189k
日期:2006.12.1
accelerates hydrazone formation and transimination through nucleophilic catalysis. To demonstrate the method, unprotected peptides are reacted and then scrambled using a hydrazone reaction under conditions relevant for biological applications. The strong enhancement in the rate of hydrazone equilibration broadens the scope of this stable imine in the field of dynamiccovalent chemistry.